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Trouble in Greenland

Greenland Ice Sheet; stalagmites and climate change; world temperature record; the dimming of Betelgeuse

Has the loss from Greenland鈥檚 vast ice sheet reached a tipping point? According to glaciologist Michalea King, the rate at which its ice flows into the sea stepped up about 15 years ago. The process of glacial retreat is outpacing the accumulation snow and ice in Greenland鈥檚 interior and the loss of Greenland鈥檚 ice to the Ocean is set to continue for many years to come.

An international study of past climate changes during the last ice age reveals how fast changes to weather patterns and climate states can reverberate around the world. During the last ice age, when temperatures rose suddenly in Greenland a series of changes to the climate in Europe and the monsoons in Asia and South America occurred almost simultaneously - within decades of each other. Climate scientists Eric Wolff and Ellen Corrick have discovered this through studies of stalagmites from caves around the world. It鈥檚 a demonstration of how rapidly and dramatically the Earth鈥檚 atmospheric system can change when it鈥檚 perturbed.

Was the hottest temperature ever on Earth recorded last weekend? A weather station in Death Valley in California recorded a temperature of 54.4 degrees C. Roland Pease discusses the controversy with extreme weather historian Christopher Burt.

Andrea Dupree of Harvard-Smithsonian Center for Astrophysics reveals the latest on the giant star Betelgeuse which to everyone鈥檚 amazement dimmed dramatically at the beginning of the year. At the time some people wondered whether it was about to explode as a supernova but Andrea鈥檚 new findings suggest an event at the star which is almost as extraordinary.

(Image: Masses of ice break off from the edge of a glacier. Credit: Press Association)

Presenter: Roland Pease
Producer: Andrew Luck-Baker

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32 minutes

Last on

Fri 21 Aug 2020 12:32GMT

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  • Thu 20 Aug 2020 19:32GMT
  • Fri 21 Aug 2020 03:32GMT
  • Fri 21 Aug 2020 08:32GMT
  • Fri 21 Aug 2020 12:32GMT

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